ExternalThis emergency light is constructed with steel housing and lightweight thermal plastic head in matching color. It is presented a simple and modern design with high efficiency LED remote heads. Universal mounting pattern and keyhole slots are stamped on the back and conduit knockouts on the sides of each unit. Circuitry◢120/347VAC、120/277VAC input ◢High out-put LED light source ◢Two 3W LED heads ◢Diagnostic/pilot LED for AC ON and Charge ◢Push button test switch ◢High performance Lead-Acid battery provides 2 hours of emergency duration ◢Complete battery recharge in 24 hoursBattery◢4V 4.5Ah Lead-Acid Battery ◢Capacity of the battery is optional in term of the requirement